On Fri, Nov 06, 2020 at 03:02:27PM -0800, Andrii Nakryiko wrote: > Add kernel module listener that will load/validate and unload module BTF. > Module BTFs gets ID generated for them, which makes it possible to iterate > them with existing BTF iteration API. They are given their respective module's > names, which will get reported through GET_OBJ_INFO API. They are also marked > as in-kernel BTFs for tooling to distinguish them from user-provided BTFs. > > Also, similarly to vmlinux BTF, kernel module BTFs are exposed through > sysfs as /sys/kernel/btf/<module-name>. This is convenient for user-space > tools to inspect module BTF contents and dump their types with existing tools: > > [vmuser@archvm bpf]$ ls -la /sys/kernel/btf > total 0 > drwxr-xr-x 2 root root 0 Nov 4 19:46 . > drwxr-xr-x 13 root root 0 Nov 4 19:46 .. > > ... > > -r--r--r-- 1 root root 888 Nov 4 19:46 irqbypass > -r--r--r-- 1 root root 100225 Nov 4 19:46 kvm > -r--r--r-- 1 root root 35401 Nov 4 19:46 kvm_intel > -r--r--r-- 1 root root 120 Nov 4 19:46 pcspkr > -r--r--r-- 1 root root 399 Nov 4 19:46 serio_raw > -r--r--r-- 1 root root 4094095 Nov 4 19:46 vmlinux > > Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > --- > Documentation/ABI/testing/sysfs-kernel-btf | 8 + > include/linux/bpf.h | 2 + > include/linux/module.h | 4 + > kernel/bpf/btf.c | 194 +++++++++++++++++++++ > kernel/bpf/sysfs_btf.c | 2 +- > kernel/module.c | 32 ++++ > 6 files changed, 241 insertions(+), 1 deletion(-) Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
